Sound chamber for loud speakers



Feb. 16, 1932. M. STETTNER 1,845,685

souun CHAMBER FOR LOUD SPEAKERS Filed June 13, 1930 INVENTOR Moe-215 STET T Na ATTORNEY Patented Feb. 16, 1932 This invention relates to improvements in an amplif ing chamber for a loud speaker and has re erence particularly to such a chamber designed especially for use in connection 5 with amplifying apparatus of the dynamic type.

The Object of this invention is to provide an amplifying chamber of this character in MORRIS STETTNER, OF .IBR OOKLYN', NEW YORK SOUND CHAMBER FOR LOUD SPEAKERS Application filed J1me 13, 1930. Serial No. 460,956.

ing the chamber, the latter is provided with uprightipartitions 15, one thereof being arranged on opposite sides of the chamber beginning about the center of the latter at the side walls and projecting towards each other at the front to form a restricted throat with which the amplifying space is arranged in the of the chamber.

form of a poly-angular figure with one side open and another side provided with an opening to receive the chassis of the dynamic speaker unit.

I accomplish this osject by means of a dequality. The trian vice hereinafter described in the specification, set forth in the claims and illustratively exemplified in the accompanying drawings, in which, Figure 1 is a plan view of the amplifying chamber showing a 'portion broken away to disclose the partitions: Figure 2 is a front elevational View of the chamber: and Figure 3 is a substantially longitudinal seea mouth. substantially the width of the rear wall 11 and of the full height of the open end eatly in the production of proper sound vo ume and volume.

tional view of the same taken on lines 3-3 of cut is:

1. An amplifying device for a loud speak- Figure 2.

Referring tothe drawings, the amplifying chamber is a hollow device constructed of wood or composition and comprises, a bottom wall 10, which is trapezoidal in shape, an 11 standing rear wall 11 projecting upward y from the shortest side of the bottom wall 10, frustrated triangularly shaped upright side walls 12 and a second trapezoidally shaped end.

wall 13 superimposed on the rear wall 11 and side wall 12, the wall 13 forming the top or instrument board provided with an opening 14 to receive the chassis of a d not illustrated. The top we 1 13 is inclined downwardly with respect to the bottom wall 10 as it rests upon the inclined sides of the side walls 12 and joins the wall 11 at the rear. The open .side of the device directs the audible sound created in the speaker and projected into the chamber through the opening 14 to escape and in order to give proper resonance to the amplified sound waves enterlar spaces found on the outside of the partitions between the latter 00 and the side walls 12 virtually establish auxiliary chambers which cushion the vibrations gathering in the main chamber and modify them into true tones at substantially any Having now described my invention what I claim and desire to secure by Letters Pater, comprising a chamber having converging walls open at one end and provided with an opening in one of the walls to admit a speaker, and converging partitions disposed at an angle to each other and to the lane of the said walls and arranged in sai chamber to restrict the mouth of the latter at the open 2. An amplifying device for a loud speaker, comprising a trapezoidally shaped bottom wall, frustrated triangular upright side walls amic speaker, and a rear wall projecting between the frustrated ends of the side walls and the bottom wall, an orificed top wall superimposed on the side and rear walls and inclined downwardly towards the rear with respect to the bottom wall, and bafiie partitions arranged in upright positions on op osite sides of the longitudinal axisof the c titions converging towards each other rom substantially midway the length of the side mber, said ar- It will be seen with reference to Figure 1, particularly, that the added bafile surface provided by the partitions 15 aids walls to points at the front in the open side corresponding with the opposite ends of the rear wall.

3. An amplifying device for a loud speaker, comprising a plurality of chambers one of which is poly angular in lateral section and frusto triangular shaped in longitudinal section, and the others are triangularly shaped and arranged one on each side adjacent the open side of the chamber, another side of the first chamber being provided with an opening to admit the sounds to be amplified.

In testimony whereof he has aflixed his signature.

- MORRIS STETTNER. 

